java.security.cert.certificateexception: no x509trustmanager implementation

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import java.security.Security;

public class AddProvider {
    public static void main(String[] args) {
        Security.addProvider(new BouncyCastleProvider());
    }
}

import javax.net.ssl.*;
import java.security.cert.X509Certificate;

public class CustomTrustManagerExample {
    public static void main(String[] args) throws Exception {
        TrustManager[] trustAllCerts = new TrustManager[]{
            new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    return null;
                }
                public void checkClientTrusted(X509Certificate[] certs, String authType) {}
                public void checkServerTrusted(X509Certificate[] certs, String authType) {}
            }
        };

        SSLContext sc = SSLContext.getInstance("SSL");
        sc.init(null, trustAllCerts, new java.security.SecureRandom());
        HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
    }
}